从新的勘探理念寻求楚雄盆地油气勘探的突破——试论楚雄盆地的深盆气勘探前景  

LOOKING FOR THE BREAKTHROUGH OF THE EXPLORATION FOR OIL AND GAS IN CHUXIONG BASIN IN TERM OF THE NEW EXPLORATION CONCEPT:ON THE EXPLORATION PROSPECTS OF DEEP BASIN GAS IN CHUXIONG BASIN

作　　者：张福东[1] 戚厚发[2] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中国石油勘探开发研究院,北京100083

出　　处：《天然气地球科学》2004年第1期28-31,102,共5页Natural Gas Geoscience

摘　　要：由于楚雄盆地构造圈闭形成期与源岩主要生排烃期不匹配,导致了长期以来按构造圈闭部署的油气勘探工作屡遭失败。深盆气理论与勘探实践表明,在盆地坳陷中心或上倾斜坡地带可以形成非构造型的深盆气藏。认为楚雄盆地具备深盆气形成的基本地质条件:上三叠统煤系厚度大,热演化程度高,生气强度可达(40～60)×108m3/km2;广泛发育致密砂岩储集层,坳陷主体部位上三叠统连片分布,天然气保存条件较好;盆地西部坳陷和北部坳陷及其斜坡区是深盆气勘探的有利地区。还认为:该盆地上三叠统煤系生、储、盖层相互叠置,可构成下生上储、上生下储和自生自储等多种成藏组合;在有断层沟通条件下,也可以于煤系之上的侏罗系地层中形成次生的常规成藏组合;若运用深盆气勘探理论,并从动态演化的观点重新评价,可望在该盆地天然气勘探上获得重大突破。As the formation of structural traps postdated the main period of hydrocarbon generation and expulsion, the exploration targeting structural traps has been unsuccessful for a considerable time. The (deep basin gas theory and) exploration outcomes indicate that deep basin gas accumulations can form and occur in the depressionional centers or the updip slope zones in the basin. The basic geological conditions, which are required for deep basin gas to accumulate, have been found to be present in the basin. The upper Triassic coal measures are thick and highly matured. Their hydrocarbon generation intensity falls in the range of (40~60)×10^(8) m^(3)/km^(2). Tight sandstone reservoirs are widely developed and these reservoirs are continuous over most of the depressional areas. In addition to the favorable source rocks and reservoirs, seal rocks are adequate. Overstacking of the source, reservoir and seal rocks in the upper Triassic led to the formation of several source-reservoir-seal assemblages: older source rocks overlain by younger reservoirs, older reservoirs overlain by younger source rocks and locally generated hydrocarbons reservoired in the same stratigraphic interval. Additionally, hydrocarbons could migrate upwards through faults to form secondary conventional oil/gas pools in the Jurassic strata. The western and northern depressions and their slopes are the favorable exploration areas for deep basin gases. It is believed that significant breakthrough can be achieved in the natural gas exploration in the Chuxiong basin if the deep basin gas theory and a dynamic evolution philosophy are applied in our exploration approach.

关 键 词：油气勘探 深盆气 天然气成藏 楚雄盆地 

分 类 号：TE122.1[石油与天然气工程—油气勘探]